When an adversary attacks a PC, the GM rolls a d20 and adds the adversary's Attack Modifier to the result. If the total meets or beats the target's Evasion, the attack succeeds; otherwise, it fails. Before rolling, the GM can grant the attacking adversary advantage, impose disadvantage, or spend a Fear to add a relevant Experience from the adversary's stat block to the total.
On a success, the adversary deals the damage listed in their stat block to the target.
When an adversary's action lets the GM make an attack against multiple targets, they make one attack roll and compare it to each target's Evasion separately.